Is it possible to create a GIF with sound effects?
Unfortunately no! Sorry :(
Gif is a really simple image format and does not and will not support sound in any way.
If you need to make animation with sound, you'll have to create a video for that. You can use .avi, .mp4 or .webm format for this feature, or set up a web page where .GIF is played at the same time as audio file.